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• W1995395637 abstract "Circulating insulin-like growth factor I (IGF-1) levels are closely associated with cardiac performance although the role of IGF-1 in alcoholic cardiac dysfunction is unknown. This study was designed to evaluate the impact of severe liver IGF-1 deficiency (LID) on chronic alcohol-induced cardiomyocyte contractile and intracellular Ca(2+) dysfunction. Adult male C57 and LID mice were placed on a 4% alcohol diet for 15 weeks. Cardiomyocyte contractile and intracellular Ca(2+) properties were evaluated including peak shortening (PS), maximal velocity of shortening/relengthening (±dL/dt), time-to-relengthening (TR(90) ), change in fura-fluorescence intensity (ΔFFI) and intracellular Ca(2+) decay. Levels of apoptotic regulators caspase-3, Bcl-2 and c-Jun NH2-terminal kinase (JNK), the ethanol metabolizing enzyme mitochondrial aldehyde dehydrogenase (ALDH2), as well as the cellular fuel gauge AMP-activated protein kinase (AMPK) were evaluated. Chronic alcohol intake enlarged myocyte cross-sectional area, reduced PS, ± dL/dt and ΔFFI as well as prolonged TR(90) and intracellular Ca(2+) decay, the effect of which was greatly attenuated by IGF-1 deficiency. The beneficial effect of LID against alcoholic cardiac mechanical defect was ablated by IGF-1 replenishment. Alcohol intake increased caspase-3 activity/expression although it down-regulated Bcl-2, ALDH2 and pAMPK without affecting JNK and AMPK. IGF-1 deficiency attenuated alcoholism-induced responses in all these proteins with the exception of Bcl-2. In addition, the AMPK agonist 5-aminoimidazole-4-carboxamide-1-β-D-ribofuranoside abrogated short-term ethanol incubation-elicited cardiac mechanical dysfunction. Taken together, these data suggested that IGF-1 deficiency may reduce the sensitivity to ethanol-induced myocardial mechanical dysfunction. Our data further depicted a likely role of Caspase-3, ALDH2 and AMPK activation in IGF-1 deficiency induced 'desensitization' of alcoholic cardiomyopathy." @default.
• W1995395637 created "2016-06-24" @default.
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• W1995395637 date "2011-07-13" @default.
• W1995395637 modified "2023-10-16" @default.
• W1995395637 title "Deficiency of insulin-like growth factor 1 reduces vulnerability to chronic alcohol intake-induced cardiomyocyte mechanical dysfunction: role of AMPK" @default.
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• W1995395637 doi "https://doi.org/10.1111/j.1582-4934.2010.01158.x" @default.
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